void background()
{
	int line, lie;
	for (line = 0; line < MaxLine; line++)
	{
		for (lie = 0; lie < MaxLie; lie++)
		{
			setmouth(line, lie);
			if (lie == 0 || lie == MaxLie - 1 || line == 0 || line == MaxLine - 1)
			{
				show[line][lie] = wall;
			}
			else
			{
				show[line][lie] = livearea;
			}
		}
	}
}
